Master Sgt. Mark Hetzer, power production supervisor with the 911th Civil Engineer Squadron, works on a mobile aircraft arresting system during a training exercise at Fort Indiantown Gap, Pennsylvania, August 13, 2016. The goal of the training was to give Airmen an opportunity to work hands-on with equipment like MAAS units.(U.S. Air Force photo by Airman 1st Class Bethany Kobily)